Might try pulling the bolts out one at a time and coating them in RTV. They intrude into the water jacket and have a propensity for leaking if they have been tightened. Could be the gasket too. If it's puking from a drain hole right under the pully your water pump may be kaput. I recently bought a refurb for 40 bucks while doing the T-belt. Figured good time to replace my 217K unit while the belts were all off.